was flat facts

[Richard Brekne]

I wonder if anyone has ever tried to actually isolate any of the factors 
mentioned and get to the bottom of the question, or if there is simply a 
tendency to replace one set of assumptions with another ?

One could actually contrive a tuning pin in a block fastened to a 
<<plate>> that is strong enough not to give and take the entire 
soundboard/bridge assembly out of the question.

One could actually measure any differences (if any) resulting from  
different soundboard/bridge assembly types in similar fashion.

One could even take the cyclic pressures of wooden parts out of the 
equation if one wanted to.

I would assume we dont really know because its not interesting enough a 
question to warrant the time and eventual expense of really finding 
out.  I mean ok... in passing its an interesting question, and fun to 
toss around some ideas... reason a bit with some known facts.  I know 
from experience for example that pianos with very very tight pins hold 
seasonal pitch better then those that are just tight.  Now I havent 
actually gone and done any controlled experiment to confirm this or 
not... so I cant be certain.  But if its true then that points in the 
direction of tuning pins having something to do with pitch loss.  The 
reasoning relative to wood / seasonal changes below also lines up as a 
good indicator.  But unless somebody actually takes the time to do a 
series of controlled experiments to confirm things, there will always be 
a significant element of the <<guess>> in any reasons we give as probable.

I would guess... :)... that pitch loss is a result of a conglomerate of 
issues. But I dont really see what we can do about it beyond contriving 
systems like DC units which demonstrably have a positive effect.


Cheers
RicB



/Then do you have a "combined" explanation of pitch drop over time?
/>/ />/ />/ Regards,
/>/ Don Rose
/

> / With every cycle, bridge caps crush, bridge pins migrate, soundboards with high panel compression 
>
> flatten, tuning pins migrate in the block. None of these tends to raise pitch in the long run. 
>
> The universal assumption is that the tuning pins are turning backward, 
> which seems unlikely to me, 
> but none of the affects of cyclic pressures on wooden parts are considered./ 
>